Selling for $800 with $1,000 adjusted basis produces a $200 loss; tax deductibility can differ because of wash sales and other rules.
Stocks
Capital loss
A loss that results when an asset is sold for less than its adjusted cost basis.
Plain-English context
Put the definition to work.
An economic loss is not automatically currently deductible; wash-sale and other loss limitations can change recognition.
Further reading and verification. Examples are hypothetical, not current quotes or recommendations. Product terms, tax treatment and market rules can change. Investor.gov — investing glossary
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